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Water Block Design / Construction Building your own block? Need info on designing one? Heres where to do it |
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02-03-2003, 08:00 AM | #26 |
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If you don't achieve turbulent flow (Reynolds 4'000), then the surface friction is irrelevant: laminar flow at those (low) flow rates doesn't care about a grainy surface. I think...
That's a nice link! I just might use it! |
02-03-2003, 08:58 AM | #27 |
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But the texture can be a problem to uncast the part...
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02-03-2003, 09:19 AM | #28 |
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If you're trying to make a mold from it, yes. (sneaky devil! )
If you need assistance getting this service, PM me, maybe we can arrange something. |
02-03-2003, 09:30 AM | #29 | |
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02-03-2003, 09:50 AM | #30 | |
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Great for flow test different variations! Jaydee: Yes, I plan to cast it in silver using jewelers tools. More exactly, a Girl I know that do jewel stuff, She's..... MMMM |
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02-03-2003, 10:08 AM | #31 |
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Ben, thanks for the offer!
Prolly this is going to take some time, I'm going to do it only when I have a final design. Hope it don't take as much time as radius. |
02-03-2003, 11:16 AM | #32 |
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Get out of my mind!
This is similar to an idea I had a while ago while working on Radius.... It would use a modified Radius type top. It would also have a concave central pin thing to "break" the flow. Bob
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02-03-2003, 11:31 AM | #33 |
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He he, I hear you
The problem with the spiral is that it leaves no fins in the center, and more importantly, no continous fins (the pin is a substitute, but with partial performance). That's a limitation of the radial design. It's a critical area of the block, because it's over the core. Without it, you won't even beat Radius |
02-03-2003, 01:24 PM | #34 | |
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Hehe, sorry lots of questions but I am very interested in this. |
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02-03-2003, 01:45 PM | #35 | ||
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As I told, she is the expert. Now where I left her phone number? Last edited by nicozeg; 02-03-2003 at 01:56 PM. |
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02-03-2003, 02:07 PM | #36 |
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Ok, if you've got "12" as the optimal # of channels, maybe you could apply what pHaestus stated in his article, about the most efficient configuration of an elbow (i.e. length of sweep).
pHaestus' article Also, I think you would do well to look into the jet inpingement effect. |
02-03-2003, 02:32 PM | #37 | |
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Finally found it. Melting point of pure silver, 1763.2 °F. This means the mold needs to be able to withstand this and a few hundered degrees more as getting silver into a fluid state has to be hotter than melting point. So the mold needs to be able to handle that temp, which means this plastic prototype needs to be able to handle around 2000F. Of course this is from my very limited knowlegde of casting, the above process could be totally wrong, but I would look into it before you try it. |
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02-03-2003, 02:44 PM | #38 |
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No no no... You're not thinking 4 dimensionally!
The mold can be used to make a plaster cast, which in turn can be used to make a sand cast, ready for silver You loose some precision because of the multiple steps, but it's cheap and easy, so who cares |
02-03-2003, 04:01 PM | #39 |
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As I know, plaster can handle silver temps. And plaster cures with water, at ambient. (It is a close relative to concrete) The main deal of most casting materials is being able to replicate a “weak” original with a high strength material. Traditionally most cast iron originals were made from carved wood.
Bruno Facca in his thread explained the characteristics of several casting sands. |
02-03-2003, 04:33 PM | #40 |
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Ben; the main factor of flow resistance in an elbow is the ratio between turn radius and pipe diameter. In this case it's not so bad.
The sharpest turn is at the beginning of the channel, close to the core; where it has a useful side effect: Centrifugal force brings the flow close to the wall, reducing the boundary layer. See? The variable radius flow channel is not casual, there’s lot of things I've thought in this design. |
02-03-2003, 05:01 PM | #41 | |
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Also, in centrifugal flow, the heavier water molecules, which are colder, will be pushed to the outside. That's good if that's where your hot spot is, but that's not the case here: it's on both sides. I will maintain that the circular motion only does one thing: add to the flow restriction. Further, because your channels are longer, you're adding more flow restriction. In Radius, the flow restriction is progressively lowered by channel splitting, for an overall minimized impact, so that the flow can reach its highest velocity within the critical area, and within an area that is not too big for the pump to handle (which I have yet to demonstrate, I know...). Anytime the water has to turn, it's restricted. I can't find it, but someone mentionned something about capillary channels: as myv65 pointed out, in flow restriction, there comes a point where the channel is so narrow, that the height doesn't matter, the restriction is the same. You should make that central post a pin, otherwise the incoming coolant will spray all around it, ignoring the pin's hot base. |
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02-03-2003, 05:41 PM | #42 | ||
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About capillars: remember that my channel widht is the same as in radius. Quote:
Consider the images I posted as a first rough sketch |
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02-03-2003, 05:49 PM | #43 | |
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02-03-2003, 06:08 PM | #44 | |
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I was really surprised by the flow graphs: I didn't think it was possible that the top of the channels would be stagnant.:shrug: |
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02-03-2003, 07:17 PM | #45 | |
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02-03-2003, 07:41 PM | #46 | |
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02-03-2003, 08:21 PM | #47 |
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How about using a nozzel like this:
and having that center pin just slightly below the bottom of it? Wouldn't that add a lot of volocity right at the center. or would this mess up the flow through the channels? :shrug: |
02-03-2003, 08:53 PM | #48 | |
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02-03-2003, 09:02 PM | #49 | |
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02-03-2003, 10:21 PM | #50 |
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A while back Jon Fettig approached me with a very similar idea. He had designed a multi-channel spiral block, but at the time we decided it would be too expensive to manufacture the small channels that he designed. Here's one of his pics.
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